Mask Sheet Support Structure to Prevent Protrusion Sagging
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Solution Overview
Problem
Existing mask assemblies in deposition processes suffer from issues of reduced deposition precision and reliability due to sagging of protrusions, leading to gaps and deformation, which affect the uniformity and accuracy of the deposition process.
Innovation Solution
The mask assembly incorporates a frame, a mask sheet with protrusions and stick seating grooves, and auxiliary sticks that are coupled within these grooves, providing structural support to mitigate sagging and enhance precision and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the mask assembly is made with small thickness to prevent shadowing, then shadowing is prevented, but structural stability deteriorates causing sagging and deformation
Solution Approach 1:
The mask sheet is divided into multiple protrusions that extend from the rear surface toward the front surface, creating segmented structural support elements. These protrusions are distributed across the mask sheet to provide localized reinforcement without increasing overall thickness, preventing sagging while maintaining the thin profile needed to avoid shadowing effects.
Solution Approach 2:
Auxiliary sticks are introduced as a third dimensional element extending in a direction intersecting with the mask sheet's primary planes. These sticks are coupled to the protrusions, adding structural support in a new dimension that reinforces the mask assembly against sagging and deformation without compromising the thin overall design.
2Stability of the object's composition
If auxiliary sticks are added to prevent sagging, then structural stability is improved, but device complexity increases
Solution Approach 1:
The auxiliary sticks are coupled to the existing protrusions on the mask sheet, merging the support function into the already-present structural elements. This integration approach adds necessary structural reinforcement while minimizing the increase in overall device complexity by utilizing and enhancing existing components rather than adding completely separate systems.
Data Source
AI summary
A mask assembly may include a frame, a mask sheet, and an auxiliary stick. The mask sheet may include a sheet frame and a protrusion protruding from the sheet frame. The sheet frame may have inner surfaces defining an opening of the sheet frame, and the protrusion may protrude toward the opening in a second direction that intersects a first direction, from one of the inner surfaces of the sheet frame extending in the first direction. The mask sheet may include a stick seating groove extending in the second direction from the protrusion to the sheet frame. The auxiliary stick may be disposed within the stick seating groove. The auxiliary stick may be provided in plurality, and the plurality of auxiliary sticks may be arranged such that the plurality of auxiliary sticks are spaced apart from each other in the second direction.